Typically, there's about 20, 25 percent turnover every year. So, every three or four years with the exception of, as is the case with the Patriots and the quarterback, you have a roster turnover.

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“Typically, there's about 20, 25 percent turnover every year. So, every three or four years with the exception of, as is the case with the Patriots and the quarterback, you have a roster turnover.”